含硫气井套管变形与修整对其性能的影响.docVIP

  含硫气井套管变形与修整对其性能的影响# 邵理云1，曾德智2，李国平1，赵军1，张智2，施太和2** （1. 中国石化中原油田普光分公司，四川 达州 636156； 5 10 15 2. 油气藏地质及开发工程国家重点实验室（西南石油大学），成都 610500） 摘要：“5· 12”汶川大地震诱导下三叠统嘉陵江组膏盐层蠕变，导致四川地区一些井不同 程度的产生了套管变形。为保证气井正常生产，对套管进行了适度整形，套变井段经历反复 修磨和胀管。若含硫天然气将窜入油套环空，经冷作硬化后的 C110 套管是否会发生环境开 裂值得高度关注，迄今尚未见到类似的研究报导或文献。本文通过模拟套变和整形，研究了 冷作硬化前后管材拉伸力学性能、硬度的变化情况，采用示波冲击测试方法研究了冷作硬化 和 NACE A 溶液浸泡对材料性能的影响，采用 NACE 0177 DCB 法得出了环空保护液中冷作硬 化对材料环境开裂的影响。研究结果表明，C110 经多次挤压和胀管修磨冷变形后，屈服强 度增加，硬度略增加；在经 NACE A 溶液浸泡后，冲击功降低，示波冲击特性显示其抗环境 开裂性能变差；在环空保护液中，H2S 分压为 1MPa、模拟井下温度压力条件下，C110 套管 冷作硬化前后 DCB 测试结果无变化，且未见环境开裂裂纹。当环空保护液防护效果良好时， 冷作硬化的 C110 套管可安全服役。本文研究成果对高含硫气田的安全开发具有重要的理论 借鉴意义。 关键词：套变；冷作硬化；硫化氢；环空保护液；环境开裂 中图分类号：TE2 20 Study on the effects of casing deformation and trimming to its performances in sulfur gas wells SHAO Liyun1, ZENG Dezhi2, LI Guoping1, ZHAO Jun1, ZHANG Zhi2, SHI Taihe2 (1. SinoPec zhongyuan oilfield, puguang branch company, SiChuan DaZhou 636156; 25 30 35 40 45 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), ChengDu 610500) Abstract: Creep of the Triassic Jialing group salt layers induced by the “5.12” Wenchuan earthquake results in casing of different degrees deformation in some of wells in Sichuan oilfield. To ensure the normal production of gas wells, moderate trimming and repeated grinding and expanding were performed to these deformation casing. If the sour gas channels into the annulus between tubing and casing, whether the C110 casing occurs environmental cracking after cold hardening in worthy of attention, and similar research report or literature have not yet been seen. By simulating casing deformation and trimming, the tensile mechanical properties and hardness were studied before and after the cold hardening process. Effects of cold hardening process and NACE A solution soaking to the material properties were studied using the instrumented impact testing method. Effects of cold hardening process to the environmental cracking in the pr